RU2505877C1 - Direct action drive motor - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: direct action drive motor is designed to turn a vacuum switch on and off. The drive has an electric motor which, directly or through a reducing gear, rotates a cam in form of a disc which has areas with a narrow and high profile, as well as a disconnection spring, a mechanical latch and a lever mechanism, the levers of which are connected to movable contacts of vacuum arc-quenching chambers and with the disconnection spring, and which performs swinging movements between on and off positions. One of the levers is attached to a roller on which the cam presses with an area with a high profile during its rotation and when performing the turn-on operation. The lever mechanism can be held in an on position by the mechanical latch. The turn-on operation involves coiling the disconnection spring and the turn-off operation occurs upon triggering the mechanical latch and turning the lever mechanism under the action of the recoiled disconnection spring in the off position. The lateral surface of the cam has a protrusion, and the lever mechanism has an additional arm which, during rotation in the on position, interacts with the protrusion and stops rotation of the cam in a position when its area with a narrow profile lies opposite the roller.

EFFECT: high reliability of operation, simple design and low current consumption of the drive.

4 dwg

Description

The invention relates to the field of electrical engineering, to the field of vacuum circuit breakers, and more specifically, to actuators for vacuum circuit breakers.

Currently, for the control of vacuum circuit breakers, mainly spring-motor and electromagnetic drives are used.

Spring-motor relate to a group of independent-acting drives [1], which use the energy of a pre-charged spring. A large number of technical solutions are known regarding their design, for example [2, 3], in which the spring is charged by an electric motor through a gearbox. Drives of this type have a common drawback - the complexity of the design, a large number of parts and, as a consequence, a limited work resource.

Electromagnetic drives belong to the group of drives of dependent (direct) action, in which electric current energy is directly used to turn on the circuit breaker. They have a simpler design, for example, patents [4, 5]. However, their disadvantage is that they have a large current consumption (several tens of amperes), and the contacts of the vacuum arcing chambers (VDK) are kept in the on (closed) position due to the residual magnetization of the magnetic circuit elements, which reduces the reliability of the circuit breaker.

Closest to the proposed, is a well-known technical solution - direct-drive motor drive, the circuit of which is stated in [6]. In the known technical solution, a direct-drive motor drive performing the on and off operations of the vacuum circuit breaker by closing and opening the contacts of the vacuum interrupter chambers (VDK), contains an electric motor that rotates in a circular motion, directly or through a gearbox, a cam in the form of a disk having sections with low and high profile, as well as a trip spring, a mechanical latch and a lever mechanism, the levers of which are connected to the movable contacts of the VDK, and to the trip spring, and to which makes swinging movements between the on and off positions, while one of the levers has a roller mounted on which the cam presses while it is turning and the switching operation is performed, and the lever mechanism can be held in the engaged position by a mechanical catch, and during the switching operation, the spring is charged disconnection, and the disconnection operation occurs when the mechanical latch is activated and the lever mechanism is turned under the action of a discharging disconnection spring to the disconnected position.

For the operation of this drive circuit, it is necessary that the cam stops after performing the switching operation in a strictly defined position relative to the roller, namely, in a section with a low profile. Therefore, in a known technical solution, the cam is connected to an electric motor (or gear) via a controlled overrunning clutch, which is controlled by a lever associated with a mechanical latch. Upon completion of the operation of switching on and the actuation of the latch, the clutch is turned off, the cam is disconnected from the electric motor, after which it stops in the desired position. A disadvantage of the known technical solution lies in the complexity of the design in the practical implementation of this drive circuit.

The purpose of the invention is to simplify the design of a direct-acting motor drive and, thereby, increase the reliability of its operation.

This goal is achieved by the fact that a direct-drive motor drive that performs the on and off operation of the vacuum circuit breaker by closing and opening the VDK contacts contains an electric motor that rotates circularly, directly or through a gearbox, a cam in the form of a disk, which has sections with low and a high profile, as well as a trip spring, a mechanical latch and a lever mechanism, the levers of which are connected to the movable contacts of the vacuum interrupter chambers and to the trip spring , and which makes oscillating movements between the on and off positions, while on one of the levers there is a roller mounted on which the cam presses with a section with a high profile during its rotation and the switching operation, and the lever mechanism can be held in the engaged position by a mechanical latch, and, during the switching operation, the disconnecting spring is charged, and the disconnecting operation occurs when the mechanical latch is activated and the lever mechanism is turned under the action of the discharging spring so me in the off position.

The novelty of the invention lies in the fact that there is a protrusion on the lateral surface of the cam, and the lever mechanism has an additional shoulder, which, when turned to the on position, interacts with the protrusion and stops the rotation of the cam in the position when its low-profile section is opposite the roller.

The design of the drive is illustrated in figures 1, 2, 3, 4.

Figure 1 presents the main parts and components of the drive.

Figure 2 shows the position of the drive parts in the off position.

Figure 3 shows the position of the parts of the drive when performing the inclusion operation at the final stage.

Figure 4 shows the position of the drive parts in the on position.

A direct-drive motor drive contains the following main parts and assemblies: an electric motor - 1, gear wheels in the form of a disk, on which there are sections with a low and high profile - 2, a cam - 3, a trip spring - 4, a mechanical latch - 5, a lever mechanism - 6 with levers - 7, which are connected by rods - 8 with movable contacts (not shown), vacuum interrupter chambers - 9, roller - 10, protrusion on the cam - 11 and an additional arm of the lever mechanism - 12. In addition, the figures show the damper - 13, the lever - 14, the shutdown solenoid - 15, the latch lever - 17, the spring preloaded contacts VDK - 18.

The drive is held in the off position (Figure 2) by a spring 4 connected to one of the levers 7. The levers 7 of the lever mechanism 6 by rods 8 are connected to the movable contacts of the VDK 9 and open them. The angle of rotation of the lever mechanism is limited by a damper, in which it abuts against the lever 14. The mechanical latch 5 is an axis with a groove, and the end of the lever 7 with the roller 10 freely passes into the groove with the latch off. The protrusion 11 of the cam 3 and the additional shoulder 12 of the lever 7 do not interact with each other, and the cam 3 can rotate in a counterclockwise direction.

Figure 3 shows the execution of the drive operation on. A voltage is supplied to the electric motor 1. The rotation from the electric motor through the gears 2 is transmitted to the cam 3, which, turning counterclockwise, presses with its high profile on the roller 10 of the lever 7, forcing the lever mechanism 6 to rotate to the on position. In this case, through the rods 8, the contacts of the VDK 9 are closed. At the same time, tension (charging) of the trip spring 4 occurs. In this case, the latch under the action of the spring 17 on the lever of the latch 16 is rotated to the on position.

After the latch is activated, the motor power is turned off. But its rotor, gear and cam parts continue to rotate by inertia until the protrusion 11 of the cam 3 rests against the additional shoulder 12 of the lever 7 and stops (Figure 4). In this case, the excess rotational energy will be transmitted through the linkage mechanism and the rod 8 to the springs preloaded 18. The linkage mechanism is held in the latched position by a latch 5, which abuts the end of the lever 7 with the roller 10. In this case, the cam 3 stops in such a position that its section with a low profile is opposite the roller 10, and the linkage mechanism can freely turn from the on to the off position under the action of the charged spring of disconnection 4 when the latch 5 is triggered. the electromagnet 15 is energized, the striker of the electromagnet acts on the end of the lever 16, turns the latch 5, into the groove of which passes the end of the lever 7 with the roller 10. Under the action of the trip spring 4, the lever mechanism 6 turns into the off position (Figure 2), the contacts of the VDK 9 , shutdown operation completed.

The proposed design of a direct-drive motor drive differs from other well-known technical solutions of motor, drive simplicity and reliability. Compared with direct-drive electromagnetic drives, the proposed drive has a lower consumption current, since when using a gearbox, an electric motor with a low current consumption can be selected, which makes it easier and cheaper to control the switch in operation.

Information sources

1. GOST R 52565-2006. “AC circuit breakers for voltage from 3 to 750 kV. General specifications. "

2. US patent, No. US 5981889, MKI H01H 3/4, publ. 11/09/1999.

3. Japanese Patent, No. UR 10125185, MKI H01H 33/66, publ. 05/15/1998.

4. RF patent, No. RU 2020631, MKI H01H 33/66, publ. 09/30/1994.

5. Patent of the Russian Federation, No. RU 2214640, MKI H01H 33/66, publ. 10/20/2003.

6. British Patent, No. GB 1405747, MKI H01H 3/26, publ. 09/10/1975.

Claims (1)

Direct-drive motor drive that performs operations of turning on and off the vacuum circuit breaker by closing and opening the contacts of the vacuum interrupter chambers, containing an electric motor that rotates in a circular motion, directly or through a reducer, a cam in the form of a disk that has sections with a low and high profile, and also a tripping spring, a mechanical latch and a lever mechanism, the levers of which are connected to the movable contacts of the vacuum interrupter chambers and the tripping spring, and the latter makes swinging movements between the on and off positions, while on one of the levers there is a roller mounted on which the cam presses with a section with a high profile during its rotation and the inclusion operation, and the lever mechanism can be held in the engaged position by a mechanical latch, and during the operation the charging spring is charged, and the disconnecting operation occurs when the mechanical latch is activated and the lever mechanism is turned under the action of a discharging spring turning it into an off position, characterized in that there is a protrusion on the side surface of the cam, and the linkage mechanism has an additional shoulder, which, when turned to the on position, interacts with the protrusion and stops the cam rotation in the position when its low profile section is opposite the roller.

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